So a week ago I sent an email to Valve about TF2 with some questions about the "Meet the Classes" videos and I just got a response. My questions were specifically about what software they used to create those videos (I assumed Maya or XSI) and sure enough, thats what they use! HOWEVER! They use another tool that he says they plan on releasing (no date set). Here is the reply:

"Sorry for the late reply. Glad to hear you're enjoying TF2. We use a mix of XSI, Maya, and an internal proprietary tool to animate the Meet the X shorts. The content we're using is almost all the same content as the game itself. We're planning on releasing the exact system & tools behind the shorts, as an addition to the SDK. I'm not sure when that'll happen, though, sorry.
Robin.

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I don't mean to be a Debbie Downer, but if "not sure when that'll happen" is what you have before you put it into the Valve Time converter...